Signaling system.



C. E. BEACH. SLGNALING SYSTEM. APPucATloN FILED ocr. 12. |914.

Patented Sept. 25, 1917.

2 SHEETS-SHEET l.

' l @wal C. E. BEACH. SIGNALING SYSTEM. APPLICATION FILED ocT. I2. I9I4.

Patented Sept; 25, 1917.

LMI I.

2 SHEETS-SHEET 2.

rsinn risica CLARENCE E. BEACH, OF BI-N,Gl'HitlVlI-l(EN,- NEW YORK,ASSIGNOR, :BYv MESNE ASSIGN- MENTS, TO THE GAMEWELL FIRE ALARM '.IFLIEG1`tAlE-IV COM?ANY, A CORPORATION `OIE" NEW YORK.

magasin Specification ,of Letters Patent.

Patented Sept. 25, 193i 7..

Application med october 12, 19514". l serial No. scema To allwhomfz'tmay f concerne' Be it zlmouirthat` I, ,CLARENCE E: BEACH, acitizen ofthe United States, residing at Binghamton, in1 the county ofBroome and rtate oi' New Yorflj, llave invented'certain new andusefulImprovements-.in Signaling Systemsyof which the follow-ing' is aspeci lication.` i

This4 inventioir relates `to signaling systemsl in whichdifferentwclassesof signals uare transmitted over the saineV circuit,and is* par ticularly adaptedltor' use in connection with municipalpolice signaling systems, although features of ythis inventionarefadaptedtor use,-either separately or in combination with each other,Witlr various signaling-'1 systems.

An object' oftthislinvention is to provide a signaling systemlhaving a.circuit includ` ing both telegraphic and= telephonie equipment and`'di-rect* current al arm mechanism so connected to the same circuitythat said alarm mechanism y may be employed Without interL ferencebetween such alarm mechanismand the telf-:graphic andtelephonicequipment.

Another object of thisinvenion is to provide such a system in which thei alarm mechanism is adapted to selectively control or i operatefeitherl or both of two sets tof f inde" pendent alarm 4(.levic'es.l

` Anotheri object of this invention is 'to provide a system capableofsimultaneouslyl signaling alarmsto partor all ofl the circuitsyoli' acommon battery system, Without opera-` tively impairing telephoniecommunication Vthrough-or between such' circuits on account oftheaction', either of groupingfthecircuits, or oftransmittinglsignalsthereon.

Another object ofthis invention is'topro` vide al 'form' of such asystem which is adapted for use in casesf where"so-called open circuitbatteries 1areremployedas `a current source', and it is thereforedesiredl to avoid any current `drain Whatever ou the current sourceexcept during thetransmission of alarm signals;

Another object of this invention isto provide improved signalformulatingV mechanism adapted to selectively transm'it code signals to'either orlboth oftwo setsloffalarm mechanisms `in such signalingsystems. i

A further object of this"l invention isto provide an* improved i relayorV controlling mechanism specially* adapted to par'allelucom necti'onin a signaling circuit,'and differentially responsive to makes andbreaks in a ground or common return connection to either side ot thesignaling circuit.

Uther objects are described in the followingI specification' and moreparticularly pointed out in the claims.

ln lso applying this invention to a signaling system employing a"plurality'ot circuits as to embody allot its features, two currentsources are provided, and a* circuit condition ychanging means isconnected with one of the current sources so as to be adapted to causevpredetermined circuitl condition changesl in all circuits supplied bysuch source. y

The circuit condition` changing means comprises alarmsignal formulatingmechanism,.and alarm selecting mechanism; the formulatiugi mechanismembodying circuit controllers arranged to alternately close two currentpaths in accordance with any desired code,-a'nd` soarranged* that saidlcu1 'rentf paths are neverboth closed; theselecting mechanism comprisinga switch, Whereby'either or both of the circuit controllers of1 theformulating mechanism may berendered eliective, and whereby either ofthe circuits controlled by: the formulating mechanism may beopened orclosed Without operating said mechanism;

A transfer switch isV providedforv each of the signaling circuits, eachof these switches 'beiugadapted to connectlits circuitto either currentsource Without simultaneously disconnecting'said sources, `so that `anycircuit 4bet-Ween the `opposite sides of` said circuit.

the telephone stations are in parallel with each other and with therelays, said impedance should comprise suitable inductive reactance.

For establishing telephonie correlation with another circuit a repeatingcoil is provided,having two substantially equal wind-- ings, one ofwhich is serially included in one side of the circuit, and the other ofwhich-is serially included in the other side of the circuit; Otherwindings are provided for these repeating coils, and means forconnecting such other windings to other circuits, as desired.

Between` each repeating coil and its associated current source transferswitch, re-

lays are provided for controlling signal mechanism.

Each of these relays is provided with two approximately equal windings,one winding of each relay being serially included in one side of itsassociated circuit, and the other winding being serially included in theother side of said circuit.

Suitable signal receiving or indicating mechanism is controlled by eachof these relays. v

The alarm controlling relay mechanism are o f novel form, and eachcomprises two electromagnets, a terminal of one magnet being connectedto one side of the circuit, and a terminal of the other magnet beingconnected to the other side of said circuit.

The 'remaining terminals of the magnets are connected to a common returnconductor, as for instance, to the ground.

An armature structure for these magnets is'so mounted in relationthereto that the energy of one of said magnets will be applied, to theportion of said structure associated with the other of said magnets,duringa portion of the movement of said armature at a leverage which issubstantially greater than the leverage at which the energy of suchmagnet will be applied to said portion during the remainder of themovement of said armature.

A contact/arm is carried by the armature structure whereby circuitconnections may be established between either of two sets of contacts,and alarm mechanism is associated with each relay, as for instance, alamp controlled by one contact, and a bell controlled by the othercontact.

For signaling systems in which it is not desired toprovide facilitiesfor transmitting alarm signals on certainf of a plurality of circuitswithout causing all such circuits ,to be affected by such signals, butone current source need be provided, and the switch mechanism fortransferring the various cir- 4cuits from one source to another can bevention may be employed by providing two Y normally. disconnected commonreturn conductors, as for instance, the ground, and a third wire, andconnecting one of the magnets ofeach alarm controlling relay between oneside of the circuit and one of the common return conductors, as forinstance, the third wire, and connecting the other magnet of such relaybetween the other side of the circuit, and the other common returnconductor, as for instance, the ground, keeping, the two common returnconductors normally disconnected from each other, and connecting the two'common return conductors through a condenser, if necessary tosecureabsenee of noise in the telephone circuit, and providingfacilities for directly connecting such .conductors by 'a lswitch (whichmay be associated with the circuit condition changing means) whenever itis desired to cause the operation of the alarm relays.

For signaling systems in which it is not necessary to maintain anelectrical balance between the circuit conductors and the common returnconductor, by connecting one magnet of each alarm relay between onecircuit conductor and the common return conductor, and connecting theother magnet of each relay between the other circuit conductor and thecommon return conductor, provision may be made fory open circuit batteryoperation by employing a retractile spring, or a permanent magnet, inplace of one of the electromagnets in the relay, and connecting theother magnet between one of the circuit conductors and the-commonreturnconductor, and arranging the relay so that z-when the armature, isin completely retracted position both alarm mechanism circuits will beopen; when in partially retracted position, one of the alarm mechanismcircuits'will be closed; and when in fully attracted position. the otherof the alarm `mechanism circuits will be closed,-

and thus all other features of this invention L :with a yiewofenablingthis inventionltofbe better understood, i and.; not as .a ilimitation4tomy claims.`

4Lilie characters. of reference l, denote similar parts ythroughout ithe accompanying Figure ..1` shows` they embodiment of l many featuresof thisin'vention as Aapplied toa closed telegraphic andocpenztelephonic circuit signaling system;

- Fig-` 2. showsthefembodiment of many features ofthisinvention asappliedito anormally. open telegraphic `:and f telephoniecirlcuit-signalingsystem, with two common reztu-rnf conductors.;v

Fig. 3 shows certain features ofV this invention -asaappliecl toanorrnally open tele- Agraphic and telephonieA circuit signaling.system, using the ground, or; but. one common returnfconductor; y

fFig. l4 isla plan `View of analarm controlling-relay .adapted for useas shown inFig. l1` and Fig. 2,

Fig. 5 is a sectional View of the relay `shown in Fig. 4, taken on theline f5-5;

Fig. 6 islasectional @View of the relay shown in Fig. 4,5 taken ontheline 6-6;

, Fig? is a View of a modifiedform ofthe :relay showninFig. 4 adaptedfor use; in the manner indicated in .Fig 13,. and;

Fig.v8 showsa diiferentsformof relay v.mechanism.embodying features ofthis in- .yenticn Referring-now togFig. 1,` A andzB represent batteries,Awhich are of `such capacity ,-45 .that eithernmay.` supplyfall4 currentrequired for telegraphing, telephoning, Yand alarm :Signaling in;all `ofthe `circuits `associated therewith.

Switch mechanisms C, D, and Eare pro- 50 yiided, one for each of, thesignaling. circuits,

and-each having lswitch arms 1'1A andz12, connected by an insulatingyoke 13, @and cooperating .with .separately insulated contacts `114,15,16md 17.

The contactsl14 and 16zare so' located with `relationto the switch arm11 thatlin moying` said arm from one contact. to the other,

it willconnect withboth` of said contacts during a lportion of i itsmovement, andthe :ce contactslv andwl'unaintain a similarrelation withswitch arm 12, the yolre113 Vbeing of such length that whilethe arm 11is touching both contacts 14 `and'l, the arm .12 iwillf touch bothcontacts' 15.-and 17.

The bus bar.1-8.connects oneterminal of the batteryA with the contacts`16 of each of the switches, ,andthe bus bar 19 likewise connects ,theotherterminal of said battery A with the contacts 17 of each of theswitches.

The conductors `20 and 21 similarly connect the terminals of battery Bwith the contacts114 and 15, respectively, of each of the switches.

`,Circuit condition changing means, consisting of the `alarm `signalformulating mechanism Fa andofthe alarm selecting mechanism G,isassociated witlrthe-battery A.

The alarm signal formulating:mechanism F comprises the cylinder'` 31whichinay be `rotated in any `desired manner, as for instance, byl'suitable clock work of gany well knownfgorm, andhaying one or moreteeth or vprojections 32, so :that ;it may be yemployed foranydesiredcode signaling.

The contact controllingtracers 33 and 34 aresomounted, with relationtoithei-r asso- -ciated Contact points and 36,1espectiyely, `andthetooth or teeth 32,that when the cylginder 31 is rotated around itsaxis, the

tracers 33` and 34 will be alternately brought into engagement withtheir contact points :and 36, and so that there will always be .atleast'one of said tracers out of contact with its associated Contact`point.

The alarm selecting mechanism `consists of the switch arm 41,permanently connected to the ground, and the free end of :said

fswitch arm comprisestwo prongs, sofas to adapt said switch armiV tomake independent contact `upon two contact studs at the same time. Thecontact studs 42, 43, 44, 45, .and 46 are arranged inthe path of theswitch arm `41, thecontacts 44 and 45 being so situated, `that theswitcharm 41 may be readily.adjustedwso.that `one of 1its prongs mayconnect with oneof thesestuds, and the other of itsprongs `with theother.

The lcontact-.stud 43 is connected through the conductor 47 to oneterminalv of battery A, contactstud 44 is connected through conductor 48to tracer` 33, point 35 is connected through conductor 49 to conductor4T, contact stud is connected,` through conductor `50 4totracer y34, andcontact stud l4t is connected `through conductor 51 to point 36 and tothe: other terminal of battery A. i

As Vthe arrangement of f corresponding parts is similar in each of thecircuits, a detailedxlescription of but one'of these-circuits will beherein given.

The relays H `and I are each provided with-two 4substantially equalwindings, one winding of each relay being included in the .conductor 101leading from switch arm 11,

and the other winding of each relay being cooperatively incl uded inithe conductor 102 leading fromswitch arm 12.

J- is' atypicalmultiple pen register whose pensare separately controlledbythe relays yH in awell known manner, so'asto be reral indicatingmechanism.

' A repeating Vcoil is typicallyindicated at L, said coil comprising thewindings 61 and 62, serially included in the conductors 101 and 102,respectively, and the windings G3. The intercommunicating switch M isassociated with the windings 63 of each repeating coil, these switchesbeing connected to conductors 64 and 65. Such number of telephone andtelegraph stations, and relay f mechanisms are connected to theconductors 101 and 102 as may be desired, the manner of connection ofthe telephone stations being typically indicated at N, and the manner ofconnection of the telegraph stations being typically indicated at O. Oneof the relay mechanisms is diagrammatically indicated at P, anotherrelay mechanism .being indicated at Q. 1 i

The relay P comprises the magnets 71 and 72, one terminal of the magnet71 being connected to the conductor 101 through conductor 73, and oneterminal of magnet 72 being connected to conductor 102 through conductor74. The remaining terminals of magnets 71 and 72 are connected to eachother at junction 89, which is connected to the ground through conductor75.

Beyond the last telegraph station, and preferably beyond the lasttelephone station or relay mechanism, the conductors 101 and 102 areconnected by the inductive impedance R, which is of sufficiently lowresistance to normally permit sufficient currentto iiow throughconductors 101 and 102 to cause the armature of the relay H associatedtherewith to move to attracted position, and having suflicient inductivereactance to prevent short-circuiting the alternating telephone current.Y

The magnets of alarm relays, such as P and Q, must be wound to so high aresistance, with relation to the current How at which the relay I-I willretain its associated armature, that the aggregate current iiow throughsuch relay mechanisms will not be sufficient to maintain the armature ofsaid relay II in attracted position when either the conductor 101 orconductor 102 is broken beyond all of said alarm relays, andtheinductive reactance of these magnets must be "sufficient to preventtheir acting to shortis such that when the circuit through such stationis closed between conductor 101 and conductor 102, the increased currentflow resulting therefrom will be suflicient to cause the associated.relay I to move its armature to attracted position. f

The condenser 103 connects the conductors l1 and 102 at a point in saidconductors between the repeating coil L andthe relays H and I for lthepurpose of facilitating the passage of alternating i telephone. ,currentfrom the telephone stations through said repeating coil. f

An alarm lamp is typically indicated at S and an alarm bell is typicallyindicated at T, a suitable source of energy for said lamp and bell beingtypically indicated at U. Fixed contacts 77 and 78 control theconnection of the lamp S with current source U, and fixed contacts 79and 80 likewise control the alarm bell T. Y

Referring now to Figs.` 4, 5 and 6, which show the construction of relayP infgreater detail, a non-magnetic plate 81 is securedl to the poles'of the magnets 71 and 72, the poles of said magnets projecting throughsuitable openings in said plate.

The armature' structure 82 is mounted upon the plate 81 and has theinclined ends 83 and 84 so formed with relation to the magnets 71 and 72that when the portion of the armature between the bends adjacent tosaidk inclined` ends is resting upon the plate 81, the end 83 willincline away` from but extend across the poles of the magnet 71, and theend 84 will incline away Vfrom but extend across the poles of the magnet72.

"The locating pinsv 85, secured to theplate` 81, pass through suitableopenings in the armature structure 82, and are arranged to permit suchmovement of said armature structure as will bring one or the other ofthe inclined ends substantially parallel to and against the poles of itsassociated magnet. When the armature structure 82 moves, in response tothe attraction of its end 83 toward the magnet 71, until said end issubstantially parallel to and against the poles of said magnet, saidarmature structure rocks on the bend adjacent to said end 83, and henceduring such movement said bend acts as a fulcrum `for said structure,and when the end 84 is moved substantially sov parallel to and againstthe poles of the vmagl crum, and that when'so rocked theV pull of themagnet upon one of the inclined ends of said structure will have a greatadvantage over the pulll of the other magnet upon the other end of saidstructure. be seen that when neither magnet is energized, the armaturestructure will .be held upon both `fulcrums by the force of gravity, andthat the magnets may therefore be energized and denergized withoutdisturbing said armature structure, so long asthepull of one magnet doesnot exceed the pull of the other magnet by the difference/in advantagewhich exists when the armature structure is resting upon but onefulcrum, and that whenever the pull of either magnet exceeds saiddiiierence, such magnet will draw toward its poles the inclined end ofthe armature structure associated therewith and 'move the other inclinedend away from the poles of the other magnet.

It will further be seen that whenever the pull of the two vmagnetsbecomes substantially equal, after the armature structure has beenrocked upon one ulcrum as just described, the superior advantage of themagnet which is acting upon the end of the armature structure which isfarthest from its supporting fulcrum, will cause the armature structureto rock upon said fulcrum to the position where itrests upon bothfulcrums, where its movement will be arrested through the substantiallyequal pull of the two magnets, as already explained.

If the relay is to be subjected to such shocks or movement as mightcause the armature structure 82 to become disengaged from the pins 85, aguard 86 should be provided to keep such structure `in engagement withsaid pins.

The contact arm 87 is mounted upon, but insulated from, the armaturestructure 82, and carries at its free end the movable contact '88 insuch position that, when the end 83 is substantially parallel to andagainst the poles of magnet`71, said bar 88 will connect thefixedterminals 77 and 78, and that when the endr 84 is in like relation tothe magnet 72, said bar will connect the iixed terminals 79 and 80.These parts therefore constitutel a circuit controller and on account ogoverning the operative condition of the alarm devices S and T maybecalled alarm controlling mechanism.

An operators set connected to the conductors 6a and 05 is typicallyshown at V.

The operation of the equipment shown in Fig. 1 is as follows.: j

When ,the enligne C? and E resa It will further upon thei-rcontacts 14Cand 15, the current path through the circuit connected to switch .C isas followsf-fr'om one terminal of battery 13V through bus bar` 20,contact 14 and switch arm 11 of switch C, the windings of relays H and land repeating coil L which are included in conductor 101, impedance R,telegraph station O, the windings of repeating coil L and relays I and Hincluded in conductor 102, switch arm 12 and contact 15 of switch C, andconductor l2,1 tothe other terminal of battery B.

Current paths also exist between conductors 101 and102 through the twomagnets ofrelays P and Q in series with each other, but the current flowthrough these relays is very slight in proportion to the current flowthrough `the impedance R on account of their high resistance. i

The current 'flow through the windings of relay H is such as to causethe armature of said relay to move to, and remain in, attractedposition, 4thereby denergizing the connection between this relay and theregister J, but the current `iiow through the windings ot' relay I isinsutiicient to cause said relayto attract its armature and therebyclose rthe circuit through its associated lamp K. l i j .As the magnets71 and 72 of each alarm relay are energized to a substantially equalextent, thearmature structure of said relays will be held upon bothfulcrums lf the transmitting mechanism at tele` graph stati-on O is nowoperated, such operation will cause a series of substantially completebreaks in the circuit through conductor V102, corresponding to thenotches in thecharacter wheel at saidstatio-n, and upon each ofthesebreaks thema guet of relay H will `permit its armature to retract vandclose its connection. through register J, and thus cause responsiveoperation of said register.

If the circuit is closed through telephone station N, such closure willpermit sufficient additional current to pass between conductors`101 and102 to cause the armature of relay I to move to its attracted positionand thereby light its associated lamp K.

The telephone call thus indicated may be answered by moving the switchMto the positionwhich connects the windings (33 of the repeating coil tothe conductors 6ft and 05, and then utilizing the operators set V forconversation with the telephone station N.

At the conclusion of the conversation, the switch M should be moved todisconnect the windings 63 from the conductors Gil and 65. and uponbreaking the circuit through telephone station N, the armature ofrelay Iwill move to its retracted position and thereby extinguish itsassociatedy lamp K., A

1i it is desired to establish telephonie through conductor 102, windingsof repeat-V communication between two circuits, as for instance, the'circuitconnected to switch C and the circuit 4'connected to switch D,this result can be accomplished by moving the switches M of both of saidcircuits so as 'l to connect their repeating coil windings 63 to theconductors 64 and 65.

If it is desired to transmit a code signal to the alarm bell T, theswitch C should be moved so thatl its arms rest upon its contracts 16and17 and the switch arm 41 should busybar `18, contact 16, arm 11,windings of .relays II and I and repeating coil L inbe'l moved to itsContact 44, and the cylinder 31 rotated so as to suitably influence thej tracerscoperating therewith. Whereupon, 15

35 will provide a connection between the each closure between the tracer33 and point ground conductor 75 oit' each of the alarm relays' and theterminal of the current source A connected to conductor 47 l During eachof such Closures, the' current flow from source A'will beas'follows-from the terminal of said current source which is connectedto conductors 18 and 47 various current paths are provided as`followst`--One path from current source A through cludedin conductor 101, which`path I will term the path through conductor 101; and another pathfromisaid terminal of current "source A through conductors 47 and 49,

point 35, tracer 33, `conductor 48, contact 44,

switch arm 41, to the ground, and from the ground `connections 75 ateach of the alarm relays through said ground connections to thejunctions89, which path I will term the ground path,

liromeach junction 89 of the alarm relays,

two current paths are provided, one path 'through its associated magnet72 and confrom each of said junctions through its asso- "clated magnet71 and conductor 73 to conductor 101 where this path joins the paththrough conductor 101, and which path I will term the path throughmagnets 71. The othery path, from each of said junctions 89 ductor 74to'the portion of conductor 102 which is between repeating coil L andimpedance R, which pathI will term the path through magnets 72.

.Another current path is provided, from conductor v101, throughimpedance R, to conductor 102, which path I will term the path throughimpedance R.

A further current path is provided,

ing coil L and relays I and H included therein, switch arm 12, contact17. and bus bar 19 to the other terminal of current source A.

kFrom the foregoing it will be seen that the current path through magnet71 is in parallel with the path through magnet 72, but in view of thedifference in potential between conductor 101 and conductor 102,

reversed, from the direction in which the current flows throughsuch'magnet when the ground connection is open, and said reversedcurrent owwill ybe very slight, as the fall of potential between thejunction 89 and the conductor 101 will only be that due to thedifference between'th'e fall of the current iiow through 'magnet71'willbe i potential resulting from the current ow the current flowthrough said magnet 72 will b e greatlyincreased. l Y

Inasmuch, therefore., as the current flow through magnet; 71 will notonly be very slight but will be in the reverse direction soas to tend todemagnetizejsaid magnet, and as.` the greatly increased current flowthrough magnet72 will strongly energize said magnet, the`armaturestructure 82 will move in response tothe attractionof said magnet-72 andconnect contactsV 79 and 80l to cause` the operation oi" alarm bell T,

It will further be seen that whenever the ground pathis broken, as bythe .separation of tracer 33 from point' 35, the energization of magnets71 and 72 willbecome equalized, as -the current will thenA flowthroughsaid magnets in series between conductors 101 and 102, and thus causearmature structure 82 vto move to break the connection between contacts79 and 80.

Owing to the peculiar arrangement fof the various partsof this system,the changes in the current flow through winding 61 ofV repeating coil Lcaused by the opening and closing of the ground path will be balanced byexactly opposite changes in thecurrent flow through winding 62 of saidcoil, and therefore will not cause anycurrent flow to be induced inthewindings 63 of said coil, and the fall of. potential between"concluetors 101 and 102 will not be altered asa result of such openingand closingof the ground path.

If it is desired tosound the alarm bell T i continuously, the switch arm41 should be moved to its contact 43,`whereupon the terminal el currentsource A connected to bus bar 18, will beconnected to ground through theconductor 47, contact 43 and switch arm 417 and the other current pathswill be thev same as those establishedwhen the tracer 33 was broughtinto. Contact with point 3 5, and

Laeori rlays to act in response to their magnets 71,

inthesameimanner in which `they acted, in response to their magnets 72,when the switch arm 41 wasconnected tocontact 44.

If it is desired to cause the alarm lamp S to burn continuously, theswitch arm 41 should; bc moved into connection with cn tact. 46,whereupon the magnets 71 will be energizedf in like manner.

Lf it is desired to transmit a code signal .toA both the alarm lamp Sand the alarm bell` T, the switch arm` 41A should* be moved to, a.position where it connects with' both breaksof theincreased` `currentlowithrough contacts 44 and` 45, whereupon the operation oit'V cylinder31 willi alternately connect the terminals of current source A to theground path, andv thus alternately cause the armaturestructures ofi thealarm relays to move 1n response to their magnets 71 and 72;

Ifit is desired to operateithecylinder 31 withoutl causing a response ofthe alarm devices` S-`l and T, the switch arm 411 should be moved tovaposition where it rests uponcontact 42'and does not touch contact 43.

Ifritisdesiredfthat a signal transmitted to some of the circuits shallnot` affect the alarm relays. of other circuits, the transfer switchesof thecircuits which itl is desired to have responsive to such alarm;signal: shouldrest upon their contacts 16 and 17,

and` the. transfer. switches-off` the circuits. which` 1t is desired?toihave unresponsive t0,

such. alarm signalf should `rest uponv theircontacts 14 and 15.

It willi be noted that. the makes-` and telephone station. N, will; notoperatively afA feet; the, alarm relayslfand: QJ, as all' such changes.will allect.A both magnets` of)` each relay to\ a substantiallycorresponding eX- tent.

It will also be= noted that iff there are a considerable number of=alarm relays4 connected across the circuit, and a seriesztele-` graphstation located between. the relay nearest to the. current source anchthe other relays4 is operated, the operation` of such` telegraph;station would unbalance all of the relays, and would imbalance` therelay` between the current: source and. such telegraph station to` an,`extent which might be suflicient tocause the operation 'of said vre-Vlay, butin practice, the signals of such telegraphic stationsv maybetransmittedby the use offbrealrs.` which are .sof short, with relationto the closed'y circuit periods of such telegraph signals, that suchalarm relay would not beoperatively a'ccted. How

ever, should' the conductor 101 or the conductor 102 be broken at such apoint that there was` a` materially greater number of alarm relays atthe side ci the break vl'arthest from the current source, the alarmrelaysbetween such break and the current sourcemight be operativelyaffected during the continuance of the break.

It it is desired to avoid a continuous alarm` in the event of such abreak, there must be no permanent metallic connection between conductors101 and 102 outside of the; central oflice, and therefore thc telegraphstations should be of the normally open circuit type and be connected inparallel# between said conductors, and the impedance R should beomitted, while two common return conductors may be provided (arranged,:tor example, as shown in Fig, 2)., or one common return conductor maybe provided and single electromagnet relays may beemployed, as indicatedin Fig. 3.

Fig. 2 lshows certain features of' my in vention applied to a systemsimilar to that show-nf` in Fig: 1 except as follows:

Only.V one circuit and one current source is shown in Fig. 2, althoughit is evident that this systemiisadapted for common bat tery operationwith other circuits, and with two current sources and transfer switches,as shown in Fig.I 1.

The impedance R' is omitted, the telegraph stations are connected inparallel between conductors 101 and 102', and instead of connecting aterminal of the magnet '71. and a terminal of the magnet 72 of eachala-rm relay to a common return ground, the corresponding terminal ofone magnet only (as magnet 72) is connected to the ground, and theterminal of the other magnet (as magnet 71)` is connected to the commonreturn conductor 104.

At headquarters the common return conductor 104 is connected` to contact90 of switch-VV, whereby said conductor 104` may be directly connectedto. the ground` whenever it is desired'to transmit an alarm signal.

fr condenser 105 may be permanently connccted between the conductor 104and the ground, so as-to substantially balance the conductors101 and102it as tar astelephone conversation 1s concerned.

In view oflthe fact that the embodiment oithis invention shown inFig. 2comprises normally open circuit, parallel connection telegraph stations,t-he connection provided l'roni` relay H 'for register J is appliedtotheV front or closed-circuit contact of said relay.

rllhe current path through the contacts of tlierelay..l is controlledlbythe back ornerswitches M 'could be interposed between said mally opencircuit contact of the relay H', so that the line lamp K, will not berendered operativev upon closures of a telegraph station, but will berendered operative only as a result of current increases due to theestablishment of a current path through a telephone station. The relaysH and T are so adjusted that the current How, upon the establishment ofa current path through a telephone station, will cause the armature ofrelay .l to move to attracted position but will not cause the armature'of relay H to so move, while a `practical shortecircuit between theconductors 101 and 102', as through the closing of the normally opencontacts at a telegraph station, will cause thearmatures of both relaysH and I to more to attracted position.

The operators set V is directly connected to the windings 63 ofrepeating coil L but if a plurality of circuits were employed, the

operators set and said windings 63, as shown in F ig. 1.

The operation of theequipmcnt shown in F ig. 2 is as follows:

When the switch W is resting upon its normally open contact 91, and thetelegraph and telephone stations are not in use, no current will flowfrom the battery A, and the relays H and I and the magnets of the alarmrelays P and Q will not be ener-k gized.

If the transmitting mechanism at telegraph station O is now operated,such operation will cause a series of closures, each 1 cause theoperation of their alarm bells T.

establishing a short ciicuit between conductors 101 and 102, andcorresponding to the teeth on the character wheel at said station. Uponeach of these closures the armatures of relays H and l will more toattracted position, the armature of relay H closing` its registerconnection, and thus causing re sponsive operation of saidv register,and breaking the connection through the contacts of relay I so as not tocause the lighting of the associated lamp K.

1f the circuit is closed through tele hone station N, such closure willpermit su cient current to pass between conductors 101 and 102 to causethe armature of relay I to move to its attracted position and therebylight its associated lamp K, but such current will be insufficient tocause the magnet of relay H to` move its armature to attracted position.

A telephone call thus indicated may be answered by utilizing theoperators set V and, upon breaking the circuit through telephone stationN at the conclusion of the conversation, the armature of relay T willmove to its retracted position and thereby eX- tinguish its associatedlamp K.

If it is desired t0 transmit a code signal to the alarm bell T, theswitch W should be moved so that its armwill rest upon contact 90, andthe switch arm 41 should be moved to its contact 44 and theytracers 33and 34 suitably influenced, whereupon each closure between the tracer 33and point 35 will provide a connection betweeny the common'returnconductor 104 and the ground conduc tor of each of thealarm relaysandthc During each of the closures between tracer r 33 and point 35, thecurrent will flow through paths corresponding to those described forlike closures in connection with Fig. 1 (exceptthat in 2, the switch Wcorresponds with the junction 89 of Fig.y 1),

and therefore the current flow through the y magnets` 71 will be veryslight and in re verse direction, so as to tend to demagnetize saidmagnets, and the current How through the magnets 72` will be greatlyincreased so as to strongly energize said magnets, and the armaturestructures 82-ofsaid relays will thus be caused to move, in response tothe attraction of said magnets72, and connect their associated contacts79 and 80 to Itwill furthermore be seen that the makes and breaks `inthe common return paths shown in Fig. 2 will have'the saine effect astained, whereby the changes in the current iiow through winding 61 ofrepeating coil L', caused by such makes and breaks, will be balanced byexactly opposite changes in the current flow through winding 62 of saidcoil, and therefore will not cause any current iiow to -bey induced inthe windings 63 thereof, and the fall of potential between conductors101v and 102 'will not be altered as a result of such opening andclosing of such common return paths.

If it is desired to sound the alarm bell T continuously, the switch arm41 should be moved to its contact 43, when the results will be the sameas from the corresponding.

operation of the switch arm 41 of Fig. l.

If it is desired to transmit a code signal to the alarm lamp S, the`switch arm 41 should be moved to its contact 45, and the tracers 33 and34 suitably influenced, whereupon each closure between the tracer 34 andpoint .36 will provide atconnection between iso through pathscorresponding to those de' scribed for like closures in connection withF ig. ,1, and therefore the current flow through the magnets 7 2 will bevery slight, and in reverse direction so as totend to de- 4magnetizesaid magnets,` and the current flow through the magnets 71 will begreatly increased so as to strongly energize said magnets, and thearmaturestructures 82 of said relays will thus be caused to move, inresponse to said magnets 71, and connect their associated Contacts 77and 78 to cause the operation of their alarm lamps S.

It will be noted that `the makes and breaks of the increased currentflow, incident to the use of a telephone station, will not operatively`affect the alarm relays 13 and Q', as all such changes will affect bothmagnets of each relay to a substantiallyV corresponding extent if thecircuit through switch "W is closed, and will not operatively affectsuch magnets if said switch is open.H It` will also be noticed that solong as switch W isopen and no telegraphic or' telephonie stations arein use, none of the alarm relays will act in` response to any break ineither the conductor 101 or the conductor 102. Howeven if during such `abreak a closurewas established through a telephone or telegraph stationfarther from the current source in the circuit than such break, part orall of the alarm relays might act in response to suchbreak during thecontinuance'of such closure.

lIf a telegraph or telephone station is operated whilethe alarm relaysare in either of their signaling positions, the `closures produced bysuch telegraph or telephone sta-- tion will decrease the current flowthrough the effective magnets thereof by increasing the fall ofpotential across the winding of the relays H and I and the repeatingcoil L in series therewith, due to the additional iiow of currenttherethrough, but such decrease will be insuiiicient to operativelyaffect said alarm relays, and in the instance of the operation ofatelegraphstation such closures should be extremely short with relationto the open circuit periods ofthe signals transmitted. j

Fig. 3 shows certain features of my invention applied to a" systemsimilar to that shown in Fig. 2 except as follows:

Only one electromagnet is provided at each alarm relay, these magnetsall'being connected between oneof the line conductors (as conductor 102)and the common return ground. j

At headquarter`s`,l` the conductor 51, instead of being connected to theterminal of the battery A to whichrconductor 102 is connected, isconnected at such an intermediate point in said battery that the fall ofpotential `between said point and said terminal, is sufficient tooperate the alarm relays for one step, but is insufficient to operatesaid relays for two steps, as will be hereinafter more fully explained.

rihe construction ofthe relays, shown in connection with` F ig. 3, isshown in greater detail in Fig. 7, in which it` will be noted that thearmature structure 82 is mounted in a manner similar to that shown inFigs. 4, 5 and 6, `and electromagnet 72 is mounted in suitable relationto the inclined end 84 of said structure, while means is provided formovingsaid end 84 away from said magnet 72, consisting of a spring 92applied to the-inclinedend 83 of said armature structure.

A movable contact 88 is carried by the Contact `arm 87, moving with thearmature structure 82, and the fixed contacts 79 and 80 are `so mountedin the path of said movablecontact 88 that when the inclined end 84 ofarmature structure 82 is moved substantially parallel to and against thepoles of electromagnet 72, said contacts 79 and 80 will be connected bythe contact 88.

The fixed contacts 77 and 78 are so mounted, in the path of the movablecontact 88', that when the armature structure 82 is resting upon both ofits fulcrums, said contacts 77 and 78 will be connected by the contact88 but when said armature structure 82 is ina position where either:inclined? end'` thereof `is substantially parallel j to the plate 81,said Contact 88 will not connect said contacts 77 and 78.

The strength of the spring 92 is such that when the magnet 72 isdenergized the armature structure will rock upon the fulcrum adjacent toits inclined end 83 until said end is moved substantially parallel toand against the plate 81', and such that when said magnet 7 2 isenergized by a current flow such as will pass therethrough whenconductor i17 is connected to ground (see Fig. 3), the pull of Vsaidmagnet 72 uponv theinclined end 811 of said structure 82 will cause saidstructure to first rock upon the fulcrum adjacent to its inclined end 83until it rests uponboth fulcrums, and to thereafterrock` upon thefulcrum adjacent to its inclinedfend 84,- until such inclined end issubstantiallyparallel to and against the poles of said magnet 72.

Owing tothe fact that the pull of the magnet 72 operates at muchgreateradvantage, against spring 92, when the armature structure 82 is rockinguponthe fulcrumadjacent toits end 88', than when said structure isrocking upon the fulcrum adjacent 'toits end 841, it is evident that amuch weaker current flow through the magnet 72, will move said armaturestructure, from the position where its end 83 is substantially parallelto and against the plate 81', to the position where said structure restsupon both of its fulcrums, than the current required to move saidarmature structure, from the position where yit rests upon both ,of itsfulcrums, to theposition where4 its inclined end 84 is substantiallyparallel to and against the poles of the magnet 72". lAnd in practice ithas been found that if the conductor 51 is connected midway between theterminals of the battery- A, such a relay as that shown in Fig. 7 may beadjusted so that it will operate, without readjustment, through widelydiffering circuit and battery conditions.

The operation of the equipment shownin Fig. 3 is as follows:

Vhen the switch arm `41 is resting upon its normally open contact 42,and the telegraphic andtelephonic stations are not 1n use, no currentwill How from the source A, and hence the relays H and I, and themagnets' 72 of the alarm relays P and Q, will not be energized, and thearmature structures of the relays P and Q will be held in such positionby their springs 92 that their associated movable contacts 88 will notconnect any of their fixed contacts.

The results of operation and use of telegraph and telephone stationsshown yin Fig. 3 correspond with Fig. 2.

i If it is desired to transmit a code signal to the alarm bell T, theswitch arm 41 should be moved to its contact 44, and the tracers 33 and34 suitably influenced, whereupon each closure between tracer 33 andpoint 35 will provide connection between the ground terminals of therelays Q and P and the terminal of the battery Al connected to conductor47.

During each of the closures between tracer 33 and point 35, the currentwill flow through the following path:

From the terminal of battery A connected to conductor 101, throughconductors 47 and 49, point 35, tracer 33, contact 44, switch arm 41 tothe ground, and from the ground connection of each alarm relay, throughthe magnets 72-of such relay, conductor 74, conductor 102 and thewindings of repeating coil L and relays I and H included/therein, to theother terminal of battery A and the resultant current flow through themagnets 72 will be comparatively great, as each'of these magnets is thusconnected across the entire battery A, with only the resistance of theground path and the path through conductor 102" in series therewith, andtherefore the armature structures 82 of said relays will be caused tomove to the position where their associated contacts S8 will connecttheir coperating contacts 79 and A80', and thuscause vtheir alarm bellsT .to sound. v

The various parts of Fig. 3 do not maintain the peculiar arangement,shown in Figs. 1 and 2, whereby changes inthe current flow through onewinding of the repeating coil caused by makes and breaks in the common`return paths shown byfsaidV iigures will be balanced by exactly oppositechanges in the current flow through the other winding of the repeatingcoil, and therefore a current How will be induced in the windings 63 ofthe repeating coil L shown in Fig. 3and the fall of potential betweenVthe conductors 101 and 102 of said figure will be somewhat altered, as aresult .of such opening and closing of the ground path.

If it is desired to sound the alarm bell T continuously, the switch arm41 should be moved to its contact 43, when the result will be the sameas when the tracer 33 is in contact with the point 35 when the switcharm is resting upon contact 44.

It will be noted that the makes and breaks of the increased current flowincident to the use of a telephone station will not operatively affectthe alarm relays AP and Q, as the only influence of such currentchanges, upon the magnets of these relays, will be to slightly alter thefall of potential across `Vthe wind ings of the relays H and I and therepeating coil winding 62Vincluded in the conductor If it is desired totransmit a code. signal to the alarm lamp S, the switch arm 41 should bemoved to its contactA 4,5, andthe tracers 33 and 34 suitably influenced,where-V upon each closure, between the tracer 34 and point 36, willprovidea Vconnection between the grounded terminals of each of the alarmrelaysand the point inthe battery A to which the conductor 51`isconnected. During each of these closures the current will flow'throughthe' magnets 72 of the alarmrelays and back to the otherterminal of the battery A, through the path described "in connectionwith the transmission of code signals when the switch arm 41 wasdescribed as resting upon the contact 44. This current How will besubstantially less than the flow when the switch arm 41 was resting uponeither cont-act 43 or contact 44, as the magnets 72" are now eachconnected across one Ihalf ofthe battery A, with the resistance of theground path and the path through conductor 102 inseries therewith. Thearmature structures 82 of said relays will therefore be caused to moveonly to the position where said structures rest upon both of theirf,ulcrums,v and their associated contacts 88 will then connect theircoperating contacts` 77 and 7 8, and kthus cause operation of theiralarm lamps S.

S continuously, the switch arm 41 should be moved to its Contact 46,when the current flow and position assumed by the armature structures ofthe alarm relays will be the same as during closures between tracer 34and point 36 when the switch arm is resting upon contact 45.

If it is desired to transmit a code signal to both the alarm lamps S andthe alarm bells T, the switch arm 4l should be moved to a position whereit connectsthe contacts 44 and 45, and the tracers 33 and 34 suitablyinfluenced, whereupon each of the closures between said tracers andcontact points will provide a connection and cause a response ofthealarm relays such as already described.

The closure of the current path through a telephone station will notprevent the described operations of the alarm relays, as such closure,`while increasing the current flow, through the windings of relays'H andI and winding 62 of repeating coil L', so as to increase the fall ofpotential across said windings, will not increase said falloflpotential' to an extent which will leave an insuihcient fall ofpotential, across the magnets 72*l of the alarm relays, to cause theintended response thereof.

Vhile the operation of a telegraph station will greatly increase thecurrent flow, through the windings of relays H and I and winding G2 ofrepeating coil L in `icluded in conductor 102, during the closuresincident to the operation of such station, and thereby greatly increasethe fall of potential across the terminals of said windings,-inpractice, the signals of such telegraph station may be transmitted bythe use of closures which are so short, with relation to the ope-ncircuit periods of such telegraph signals, that the alarm relays willnot be operatively aected thereby.

It will be seen that, with the various parts arranged as shown in Fig.3, none of the alarm relays will act in response to any break in eitherthe conductor 101 or the conductor 102". However, if durino such a breaka closure was established through a telephone or telegraph stationfartherfrom the current source in the circuit than such break, part orall of the alarm relays might act in response to such a break during thecontinuance of such a closure.

lt is evident that a wire conductor may be employed in the place of theground connection between the switch arm 4l and the conductors 75.

\ ln employing the particular embodiment of the features of thisinvention shown in Figs. 2 andA 3, it is necessary to limit the numberof alarm relays to one which will pass a currentinsuiiicient to causethe relay I toV act to close its circuit.

Fig. S shows ai form ofrelay so embody-` ing certain features of thisinventiom-that" said relay may be used in the place of the relay shownin Figs. l, 2, 4, 5, and 6. Or by substituting a spring (such as thespring 92 shown in Fig. 7) or a permanent magnet for one of theelectromagnets shown in Fig. 8, the relay shown in said figure may beused in place of the relays shown in Figs. 3 and 7.

In constructing the relay shown in Fig. 8, electromagnets 71 and 72 aresuitably mounted, and an armature structure is provided therefor,consisting of the inclined ends 83 and S4, pivoted at 203 and 204, andcarrying the armatures 201 and 202, respectively.

The springs 205 and 20G are connected to the inclined ends S3 and '84,respectively, in such manner as to tend to move said ends toward themagnets 71 and 72.

The strut plate 81 passes between the inclined ends 83 and 84, and isprovided with the locating pins S5 extending through suitable openingsin the inclined ends 83 andv84.

As the transmission of motion, from the inclined end S3`to the inclinedend 84, through the plate S1 is similar to the correspondingtransmission between inclined end S3 and inclined end 84 in Figs. 4, 5,and G, the points of engagement between thc inclined ends `83 and 84 andthe plate 81 are, for want of a better term,` hereinV called fulcrums.

The fulcrums are so positioned as to hold the inclined ends 83 and S4 asuitable dista-nce from their coperating magnets.

When the armature structure moves, in response to the atraction of theinclined end 84, toivard the magnet 72 until the armature 202 issubstantially parallel to and against the poles of said magnet, saidinclined end 84 rocks onthe corner of the plate Si adjacent to the freeend of said inclined end S4, and the inclined end 88 rocks on the cornerof the plate 81 adjacent to the pivoted end of said inclined end 83, andhence during said movement said corners act as a fulcrum for saidstructure, and when the armature structure is moved, in response to thcattraction of the inclined end 88, toward the magnet 71 until thearmature 201 is substantially parallel to and against the poles of saidmagnet, the corner' of the plate 81 adjacent to the free end of saidinclined end 83, and the corner of said plate 81 adjacent to the pivotedend of the end 84, act as a ful'crum for said structure.

lt will therefore be seen that two fulcrums are soprovided that thisarmature structure is adapted to rock upon either fulcruin, and thatwhen so rocked the pull of ainagnet upon one of the inclined ends ofsaid structurewill have a great advantage overthe pull of the othermagnet upon the other 'end of said structure. 1t will -further be seenthat when neither magnet is energized, the armature structure will beheld upon both fulcrums by the action of the springs 205 and 206, andthat the magnets may therefore be energized and denergized withoutdisturbing said armature structure, so long as the pull of one magnetdoes not exceed the pull of the other magnet by the difference inadvantage which exists when the armature structure is resting upon butone fulcrum, and that whenever the pull of either magnet exceeds saiddifference, such magnet will draw toward its poles the end of thestructure associated therewith and move the other end away from thepoles of the other magnet.

It will further be seen that whenever the lpull of the two magnetsbecomes substantially equal, after the armature structure has beenrocked upon one fulcrum, as just described, the superior' advantage ofthe magnet which is acting upon the end whose supporting fulcrum isnearest to its pivot, will cause said armature structure to rock uponsaid :tulcrum to the position where both fulcrums become eiiective,where the movement of said structure ywill be arrested through thesubstantially equal pull of both magnets and both springs, as alreadyexplained.

The ends S3 and Si may be connected to one 'conductor of the currentsource U (see F ig. 1) and thus form an operative equivalent to contacts77 and 79, and the contacts 78V and 80l may be connected to the lamp Sand bell T so that said lamp and bell will be controlled as shown inFig. l.

Having now fully described this invention, what I claim and desire tosecure by Letters APatent of the United States is:

l. In an electric signaling system: two current sources; a plurality ofsignaling circuits each having connected thereto,-switch mechanism forconnecting said circuit to either current source without simultaneouslydisconnecting said sources, telegraphic signal receivingmechanism,telephonic signal indicating mechanism, one or moretelegraphic transmitting stations, one or more telephone stations, relaymechanism adapted to operatively affect certain alarm receiving orindicating devices upon a predetermined change in the condition of saidcircuit and to operatively affect other alarm receiving` or indicatingdevices upon a different predetermined change in the condition of saidcircuit, and means :tor establishing telephonic correlation with anothercircuit;

circuit condition changing means associated with one of said currentsources and adapted to cause said predetermined changes in the conditionof circuits connected to said source; and conductors between saidmechanisms and stations and said circuit c ondltion changing meanswhereby said circuit condition changeswill operatively affect said relaymechanism but will not operatively aii'ect the transmission oftelegraphic signals or telephonic communicationsnin said circuits.

2. In an electric signaling system: two current sources; a plurality Vofsignaling circuits each having connected thereto,-switch mechanism forconnecting said circuit to either current source without simultaneouslydisconnecting said sources, telegraphic signal receiving mechanism,telephonic signal indicating mechanism, one Vor more telegraphictransmitting stations, one or more telephone stations, relaymechanismadapted to operatively affect certain alarm receiving orindicating devices upon a predetermined change in the condition of saidcircuit and to operatively alect other alarm receiving or indicatingdevicesgupon a dilierent predetermined change in the condition olf-saidcircuit, and means orestablishing telephonic correlation with `anothercircuit.; alarm signal formulating mechanism associated with one of saidcurrentjsources;

alarm selecting mechanism adapted to control said alarm signalformulating mechanism to cause either or'both of said predeterminedchanges in the condition of circuits connected to said source; andconductors between said mechanisms and stations whereby said circuitcondition` changes will operatively affect said relay mechanism but willnot operatively aect the transmission lof telegraphic signals ortelephonic communications in said circuits. y

, 3. In an electric signaling system: two current sources; circuitcondition changing means associated with one of said `current sourcesand Aadapted to causea predetermined change in the condition of circuitsconnected to said source; a plurality of signaling circuits each havingconnect-ed thereto,-.-switch mechanism for connecting said circuit toeither current source kwithout simultaneously disconnecting saidsources, telegraphic signal receiving mechanism, telephonic vsignalindicating mechanism, one or more telegraphic transmitting stations, oneor more 4telephone stations, and oneor more relay mechanisms eachadapted to operatively aect alarm 4receiving or indicating devices whensaid circuit is connected to the current e source vhaving said circuitcondition changing-means associated with it and said circuit conditionchangingmeans is operated; and conductorsbetween all of said mechanisms,stations, and said circuit condition changing `means whereby theoperation of said circuit condition changing-means will not operativelyaiiect the transmission of Atelegraphic signals or telephoniccommunications in any of said circuits. i i

rse

4; In an electric signaling system: two current sources; circuitcondition changing means associated with one of said ucurrent sourcesand adapted to1 cause a predetermined .change in the-conditionofcircuits connected to said source; a plurality of signaling circuitseachhaving connected thereto,-switch mechanism for connecting saidcircuit to either current source without simultaneously disconnectingsaid sources, telegraphic signal receiving mechanism, telephonie signalindicating4 mechanism, one or more telegraphic transmitting stations,one or more telephone stations, one or more relay mechanisms eachconstructed and arranged to operatively alect alarm receiving orindicating devices when said circuit is connected to the current sourcehaving said circuit condition changing-means associated with it and saidcircuit condition changingmeans is operated,I and, means forestablishing telephonie correlation with another circuit; landconductors' between all of said mechanisms, stations, and saideircuitcondition changingA means whereby the operation of said circuitcondition changingmeans will not roperatively affect `the transmissionoftelegraphic signals ortelephonic communications in any of saidcircuits.V

5. In an electricV signaling` system: two

Acurrent sources; circuit condition changing means associated with oneof said current sources and adapted to cause a predetermined changeinthe condition ofcircuits connected to said source; a plurality ofsignaling 'circuits each having connected thereto,- switch mechanismorconnecting said circuit `to either current source without simultaneously`disconnecting 4 said sources, telegraphic signal i receiving mechanism,telephonie signal indicating mechanism, one or moretelegraphictransmitting stations, one-or more telephone stationseach having acentral energy telephone set, one-or more relay mechanisms eachconstructed and arranged to operatively aiect alarm receiving orindicating` devices when? said circuit' is connected tothe current'tsource having said circuit condition changing-means associated with itand said circuit conditionV changingmeans isV operated, and means forestablishingtelephonic correlation with another circuit; and conductorsbetween all of A said mechanisms, stations, vand sai'd circuit conditionchangingmeans whereby the operation of said circuit conditionchangingmeansl will not operatively affect -the transmission of`telegraphic signals or -telephonic communication in any of saidcircuits. y

i 6.Y ln an `electric signalingfsystem, `the combination of a-'pluralityof signaling-circuitsA leading from a central station, two

current sour-ces therefor, telegraph-transmitting stations, `telephonestations, relaymechanism with assoclated alarm-mechal nism arranged insaid circuits, telegraphic signal-receiving mechanism, and telephoniesignal-indicating mechanism at the central station responsive to thetelegraph-transmitting stations and telephone'A stations in saidcircuits, a circuit condition changingmeans at the central-station forthe relay mechanisms, associated with one of the current sources only,separate switches for connecting the signaling circuits with eithercurrent source to the exclusion ofthe other, and when connected with thecurrent source with which said circuit condition changingmeans` isassociated, will cause responsive operation'of .the relay mechanism andits associated alarm mechanism in the circuit or` circuits so connectedupon operation of the circuit condition changing-means therefor, and theother signaling circuits will not be controlled by the operation of thecircuit condition changing-means.

7. In an electric signaling-circuit, a current source, telegraphicsignal-receiving and telephonic signal-indicating mechanism at a centralstation, twoconductors connecting inseries lsaid, mechanisms and saidcurrent source and extending from said station,and including beyond saidstation, one or more telegraphic transmitting-stations, one or moretelephone stations, and one or more relaymechanisms, each adapted tocontrol oneyor more alarm-receiving or 1ndicati-ng devices, a thirdconductor connected to the relay-mechanisms, and movable meansfatthecentral station to `connect said third conductor with a terminal ofthe current' source, whereby the relay-mechanism is caused to respond.

8. In an electric signaling circuit: a current source; one or moretelegraphic transmittingstations; one or more telephone stations one ormore relay mechanisms each adapted to control one or more alarmreceivingorindicatingdevices; two parallel conductors' connecting thecurrent source, all of said stations, and relay mechanisms, andtelegraphic signal receivingand telephonie signalfindicating i mechanismi serially included inthe circuit between `said current source andtheparallel `connections to all of said stations `and relay mechanisms;a third conductor permanently connected to each relay mechanism; andmovable means for connecting said third conductor to a 'terminal of thecurrentsource, whereby the relay-mechanism is caused tol respond;l

9. Inan electric signaling circuit: a current source; one or moretelegraphic transmitting. stations; one or more telephone stations; oneor more` relay mechanisms each adapted to control one or `more alarmreceiving or indicating devices; two parallel conductors connecting thecurrent source, allot said stations, and relay mechanis1ns,-andtelegraphie signal receiving and telephonie wherebythe'relay-mechanism'is caused to 60 Y 2 telegraphic signal receiving andtelephonie signal indicating mechanism, including an inductivereactance, serially included 1n c1r# cuit between said current sourceand .the parallel connections to all of said stations and relaymechanisms; a third conductor permanently connected to each relaymechanism; and movable means for connecting said third conductor to aterminal of the current source, whereby the relay-,mechanism is causedto respond.

10. In an electric signaling circuit: a current source; one or moretelegraphie transmitting stations; oneor more telephone stations; one ormore relay mechanisms ca ch adapted to control one or more alarm receiveing or indicating devices; two' conductors connecting in parallel thecurrent source, all of said stations, and relay mechanisms,v-and eachserially including telegraphic signal receivingr and telephonie signal"indicating mechanism betweenV said current source and the parallelconnections' to all of said stations and relay mechanisms; a repeatingcoil having one winding connected in series 1n one of said twoconductorsy and another winding connected in seriesin the other of saidtwo conductors, between the telegraphic and telephone signal mechanismand all oi said stations and relay mechanisms; a third conductorconnected to each relay mechanism; and means for connecting said thirdconductor to a terminal ofthe current source. l1. In an electricsignaling circuit: a current source; one or more telegraphic trans'-mitting stations; one or more telephone stations; one or more relaymechanisms each adapted to control one or more alarm receiving orindicatingdevices; two parallel conductors connecting the currentsource, all of said stations, and relay mechanisms,'-and telegraphicsignal receiving and telephonie signal indicating mechanism seriallyineluded in circuit between said current source and the parallelconnections to all of said stations and relay mechanisms; a thirdconductor permanently connectedy to each relay mechanism at a point,electrically, about midway between said two conductors; and

` movable means for connecting said third conductor to a'terminal of thecurrent source,

respond. e

12. Inan electric signaling circuit: a current source; one or moretelegraphic transmitting stations; onel or more telephone stations; oneor more relay mechanisms each adapted to control one vor more alarmreceive ing or indicating devices; `two parallel conductors connectingthe current source, all of said stations, and relay mechanisms,and

signal indicating mechanism, including an inductive reactance, seriallyincluded in circuit between said current source andthe parallelconnections to all ofsaid stations and relay mechanism; a thirdconductor permanently connectedA to `each relay mechanism, at a point,electrically, aboutmidway between said two' conductors; and movablemeans for connecting said third conductor to a terminal of the currentsource, whereby the relay-mechanism is'caused to'respond.

13. In a signaling mechanismytwo magnets, armature structureA so mountedwith relation to said magnets as` to be operatively unaffected bysubstantially equivalent energization of both of said magnets, and alarmcontrolling mechanism operatively atected by said structure only uponandduring a predetermined excess energization of a cer` tain one of saidmagnets. '14.k In a signaling mechanism; two magnets, armature structureso' mounted with relation to said magnets as to be operativelyunaffected by substantially equivalent energization of both of saidmagnets,alarm con-y trolling mechanism operatively aiected by saidstructure only upon and vduring a predetermined excess energization of acertain one of said magnets, and other alarmcontrolling mechanismsimilarly affected 'only upon and during a predetermined excessenergization of the other ofsaid magnets.V 15. A signaling circuitcomprising two conductors; a common return conductor; Vrelay mechanismcomprising two electromagnets each having a terminal connected to saidcircuit and a terminal connected to the common return conductor; anarmature structure so mounted withrelation to said magnets as to beoperativelyl unaffected by substantiallyL equivalent "energization' ofboth of said magnets; alarm controlling mechanism operatively affectedby said structure only uponra predetermined excess magnets; conductorsconnecting 4the independent terminals of said magnets; a currentsourcebetween said conductors;` and means for connecting either Vof saidconductorsv with all of said `common terminals'. 17. A current source;circuit conductors connected to theterminals of saidcurrent source acommon return conductor; signal formulating mechanism comprising twocircuit controllers, one connected to one .terf

minal oi' the current source and the other connected to the otherterminal ot the current source, and means for alternately closing,` saidcircuit controllers, so arranged that there is no time during` whichboth ot said circuit controllers are closed, and; means for connectingthe common return conductor to one or the other terminal of the currentsource or to either or both of said circuit controllers.

18. A current source; circuit conductors connected to the terminals ofsaid current source; a common return conductor; signal formulating`mechanism comprising two circuit controllers, one connected to one terminal of the current source and the other connected to the otherterminal of the current source, and means for alternately closingsaidcircuit controllers, so arranged that there is no time during which bothof said circuit controllers are closed, and; means for connecting the.common return conductor to one or the other terminal of the currentsource or to either or both of said circuit controllers, or to an opencontact.

19. A current source; circuit conductors connected to the terminals ofsaid current source; a common return conductor; signal formulatingmechanism comprising,` two circuit controllers, one connected to oneterminal of the current source and the other connected to the otherterminal of the current source, and means for alternately clos ing, saidcircuit controllers, so arranged that there is no time during which bothof said circuit controllers are closed, and; a switch having a pluralityof contacts, one being connected to one circuit controller, another tothe other circuit controller, another to one terminal of the currentsource, another to the other terminal of the current source, and anotherbeing open, the common contacting member of said switch being,`connected to the common return conductor.

20. A current source; circuit conductors connected to the terminals ofsaid current source; a common return conductor; signal formulatingmechanism comprising two circuit controllers, one connected to oneterminal of the current source and the other connected to the otherterminal of the current source, and means for alternately closing` saidcircuit controllers, so arranged that there is no time during which bothof said circuit controllers are closed, and; a switchhaving a pluralityof contacts, one being connected to one circuit controller, another tothe other circuit controller, another to one terminal of the currentsource, another to the other terminal of the current source, and anotherbeing` open, the common contacting` member of said switch beingconnected to the common return conductor, said switch being arranged topermit contact of the common contacting inember with both of the circuitcontroller con tacts at one time.

ln witness whereof, I hereunto subscribe my name, this 10th day ofOctober, A. D.,

C. E. BEACH. lVitnesses M. L. THOMAS, R. C. PALMATIER.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents Washington, D. C.

